CN100464941C - Method for producing 8.8-grade high-strength fastener - Google Patents

Method for producing 8.8-grade high-strength fastener Download PDF

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Publication number
CN100464941C
CN100464941C CNB2007100211680A CN200710021168A CN100464941C CN 100464941 C CN100464941 C CN 100464941C CN B2007100211680 A CNB2007100211680 A CN B2007100211680A CN 200710021168 A CN200710021168 A CN 200710021168A CN 100464941 C CN100464941 C CN 100464941C
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wire rod
anneal
medium carbon
grade
cold
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CNB2007100211680A
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CN101028680A (en
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苏世怀
于同仁
胡孝三
张步海
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Maanshan Iron and Steel Co Ltd
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Maanshan Iron and Steel Co Ltd
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Abstract

A technology for manufacturing the high-strength (class 8.8) fastener includes such steps as providing non-annealing cold-forged steel rod, acid washing, phosphorizing, coating, drawing, cold-forging, quenching, tempering, and surface treating.

Description

A kind of 8.8 grade high-strength fastener manufacturing technique methods
Technical field
The invention belongs to no cutting metal machining, relate in particular to the securing member processing method.
Background technology
Along with the raising of fastener strength grade, the securing member of 8.8 grades and above intensity is processed by the medium carbon cold heading steel steel.Current, the metallographic structure of the medium carbon cold heading steel that uses is: the pearlite of ferrite+flaky carbide, the wire rod of this tissue, intensity, the hardness height, the contraction percentage of area is low, and securing member mainly adopts cold upset forming, and material often will bear 70~80% total deformation in manufacturing process, when in use the carbon The cold heading steel is made 8.8 grade bolts, for making the intensity of material, hardness reduces, section shrinks high, must carry out " two draw one move back " PROCESS FOR TREATMENT, promptly will carry out pickling earlier, drawing, several procedures such as spheroidizing (or soft annealing) and drawing, make material softening, cold upset forming, Q-tempering becomes product then, and its defective is a large amount of energy of annealing operation consumption, cause metal loss, contaminated environment, and increased the skin decarburization chance of steel wire, influence the quality stability of bolt.Pollute and stabilized product quality in order to cut down finished cost, to reduce, what increasing Standard Component Factory wished that Metallurgical Factory can provide directly drawing, cold-heading exempts to anneal cold-forging steel wire rod or can significantly shorten the follow-up spheroidizing processing time and soften the cold-forging steel wire rod.
Summary of the invention
In order to overcome the deficiency that prior art exists, the purpose of this invention is to provide a kind of 8.8 grade high-strength fastener manufacturing technique methods, adopt the medium carbon cold heading steel wire rod of exempting to anneal once to be drawn into the technology material, direct then cold-heading molding, simplify working process, reduce and pollute, save processing charges.
A kind of 8.8 grade high-strength fastener manufacturing technique methods are characterized in a, adopt the medium carbon cold heading steel wire rod of exempting to anneal, and wire rod is carried out pickling, phosphatization, dust processing; B, wire rod once is drawn into the technology material, for intensity, hardness and the annealed material that guarantees to exempt from the annealing process material is suitable, makes things convenient for materials, guarantee smooth drawing and stabilised quality that the drawing draft is controlled at 3~10%; C, cold-heading, thread rolling moulding; D, quenching, tempering then; E, carry out surface treatment at last.
The present invention further improves the medium carbon cold heading steel wire rod composition (wt%) of exempting to anneal, c:0.32~0.38, si:0.10~0.30, Mn:0.35~0.70, P≤0.025, S≤0.015, surplus is Fe, through high-speed rod-rolling mill production line low temperature rolling, control cooling, ferrite content is more than 60% in the steel, carbide spheroidization or degeneration in the pearlite.
Compared with prior art, its advantage is, the employing medium carbon cold heading steel wire rod of exempting to anneal, tensile strength, hardness reduce, and plasticity improves, do not need annealing in process just can directly beat interior hexagonal, flange bolt and nut before the cold-heading, its mould loss is suitable with annealed material, simplifies working process, and saves processing charges, also can avoid defective, constant product quality because of the generation of transformation of the way worker technology material.
The specific embodiment
Embodiment 1:
Make the M6 bolt and adopt the medium carbon cold heading steel SWRCH35K-M wire rod of exempting to anneal, specification Φ 6.5mm, after pickling, phosphatization, dust, once be drawn into Φ 5.7mm technology material, directly cold-heading, thread rolling moulding, quenching, tempering then, turn black at last or zinc-plated processing, mechanical performance meets Chinese Industrial Standards (CIS) GB/T3098.1-2001.
Embodiment 2:
Make the M8 bolt and adopt the medium carbon cold heading steel SWRCH35K-M wire rod of exempting to anneal, specification Φ 8.0mm, after pickling, phosphatization, dust, once be drawn into Φ 7.5mm technology material, directly cold-heading, thread rolling moulding, quenching, tempering then, turn black at last or zinc-plated processing, mechanical performance meets Chinese Industrial Standards (CIS) GB/T3098.1-2001.
Embodiment 3:
Make the M10 bolt and adopt the medium carbon cold heading steel SWRCH35K-M wire rod of exempting to anneal, specification Φ 10.0mm, after pickling, phosphatization, dust, once be drawn into Φ 9.5mm technology material, directly cold-heading, thread rolling moulding, quenching, tempering then, turn black at last or zinc-plated processing, mechanical performance meets Chinese Industrial Standards (CIS) GB/T3098.1-2001.
Embodiment 4:
Make the M12 bolt and adopt the medium carbon cold heading steel SWRCH35K-M wire rod of exempting to anneal, specification Φ 12.0mm, after pickling, phosphatization, dust, once be drawn into Φ 11.5mm technology material, directly cold-heading, thread rolling moulding, quenching, tempering then, turn black at last or zinc-plated processing, mechanical performance meets Chinese Industrial Standards (CIS) GB/T3098.1-2001.
Embodiment 5:
Make the M14 bolt and adopt the medium carbon cold heading steel SWRCH35K-M wire rod of exempting to anneal, specification Φ 14.0mm, after pickling, phosphatization, dust, once be drawn into Φ 13.4mm technology material, directly cold-heading, thread rolling moulding, quenching, tempering then, turn black at last or zinc-plated processing, mechanical performance meets Chinese Industrial Standards (CIS) GB/T3098.1-2001.
Embodiment 6:
Make the M16 bolt and adopt the medium carbon cold heading steel SWRCH35K-M wire rod of exempting to anneal, specification Φ 16.0mm, after pickling, phosphatization, dust, once be drawn into Φ 15.3mm technology material, directly cold-heading, thread rolling moulding, quenching, tempering then, turn black at last or zinc-plated processing, mechanical performance meets Chinese Industrial Standards (CIS) GB/T3098.1-2001.

Claims (2)

1, a kind of 8.8 grade high-strength fastener manufacturing technique methods is characterized in that: a, adopt the medium carbon cold heading steel wire rod of exempting to anneal, wire rod is carried out pickling, phosphatization, dust handle; B, wire rod once is drawn into the technology material, the drawing draft is controlled at 3~10%; C, cold-heading, thread rolling moulding; D, quenching, tempering then; E, carry out surface treatment at last.
2,8.8 grade high-strength fastener manufacturing technique methods according to claim 1, it is characterized in that exempting to anneal medium carbon cold heading steel wire rod composition (wt%) c:0.32~0.38, si:0.10~0.30, Mn:0.35~0.70, P≤0.025, S≤0.015, surplus is Fe, through high-speed rod-rolling mill production line low temperature rolling, control cooling; Exempt from ferrite content to anneal in the medium carbon cold heading steel more than 60%, carbide spheroidization or degeneration in the pearlite.
CNB2007100211680A 2007-04-02 2007-04-02 Method for producing 8.8-grade high-strength fastener Active CN100464941C (en)

Priority Applications (1)

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Application Number Priority Date Filing Date Title
CNB2007100211680A CN100464941C (en) 2007-04-02 2007-04-02 Method for producing 8.8-grade high-strength fastener

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CN100464941C true CN100464941C (en) 2009-03-04

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Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101948944A (en) * 2010-09-27 2011-01-19 深圳市昌红模具科技股份有限公司 Processing method for preventing deformation of chassis mould of full-automatic coffee machine
CN101972784A (en) * 2010-11-19 2011-02-16 江苏泰力钢绳有限公司 Method for drawing steel wire
CN103862229A (en) * 2012-12-13 2014-06-18 宁波金鹏高强度紧固件有限公司 Automobile steering device auxiliary frame connecting bolt processing technology
CN103572012B (en) * 2013-11-06 2015-06-24 南京工程学院 Rapid spheroidizing technique in bolt manufacturing process
CN103990937B (en) * 2014-01-02 2017-01-18 昆山艺可五金有限公司 Production technology for hexagonal bolt
CN103934653A (en) * 2014-04-16 2014-07-23 江苏盛大金属制品有限公司 Method for processing high-strength high-ductility reinforcing steel bars special for high speed railway
CN104400344A (en) * 2014-10-30 2015-03-11 无锡市威海达机械制造有限公司 Bolt manufacturing technology
CN105063479B (en) * 2015-08-25 2017-09-29 内蒙古包钢钢联股份有限公司 A kind of production method of boron-containing cold heading steel
CN105478502A (en) * 2015-12-29 2016-04-13 东莞市科力钢铁线材有限公司 Production process of non-annealed wire material for pulling rivet pull rod
CN107299285A (en) * 2017-06-15 2017-10-27 徐林丽 One kind is used to manufacture high intensity standard part steel and its manufacture method
CN109468543A (en) * 2017-09-08 2019-03-15 湖南铂固标准件制造有限公司 It is a kind of for producing the cold-forging steel and its manufacturing method of self tapping self-drilling screw
CN109531063A (en) * 2018-11-27 2019-03-29 重庆旺达汽车零部件有限公司 A kind of processing method of high-strength bolts

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JP2001062639A (en) * 1999-08-20 2001-03-13 Kobe Steel Ltd High strength bolt excellent in delayed fracture resistance and manufacture thereof
CN1443946A (en) * 2003-04-17 2003-09-24 南京汽车集团有限公司 Production process of high strength bolt with above 1300MPa
CN1706977A (en) * 2004-06-10 2005-12-14 东北大学 Production process of high-strength cold heading rivet and screw steel

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